21114792989 has 2 divisors, whose sum is σ = 21114792990. Its totient is φ = 21114792988.

The previous prime is 21114792983. The next prime is 21114793039. The reversal of 21114792989 is 98929741112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11953048900 + 9161744089 = 109330^2 + 95717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21114792989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21114792989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21114792983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557396494 + 10557396495.

It is an arithmetic number, because the mean of its divisors is an integer number (10557396495).

Almost surely, 2^21114792989 is an apocalyptic number.

It is an amenable number.

21114792989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21114792989 is an equidigital number, since it uses as much as digits as its factorization.

21114792989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 53.

The spelling of 21114792989 in words is "twenty-one billion, one hundred fourteen million, seven hundred ninety-two thousand, nine hundred eighty-nine".